100
Frequent extinctions of the light occurred from various causes connected with the machinery and apparatus, and the oil light had, at such times, to be substituted
Unknown[1]
The machines now in use at Souter Point and the South Foreland are the 'alternating current' machines
Unknown[1]
To guard against any breakdown in the electric light, duplicate steam-boilers, duplicate engines, duplicate electrical machinery, and duplicate electric lamps are provided
Unknown[1]
The machines may be lengthened or shortened; so may the dark intervals; coloured flashes may be used, or coloured and white flashes alternately; and so on
Unknown[1]
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